Safety device for punch-presses.



n w. 1. PAM'ER.A4 rSAFETY DEVICE FOR PUNCH. PRESSES.

APPLlcAUoN FILED Augfnjsm.

I Patented May 23,1916.'

lWILLIAM J. PARKER, or sT. LoUIs, MISSOURI.

VsiiEErY nEvIcE Eon PUNCH-ranssns.

To all whom it lmay concern:

Be it known that I, VILLIAMJ. PARKER,

. a citizen ofthe United States, and residing at St. Louis, in the State of Missouri, have invented acertain new and useful Improvement in Safety Devices for Punch-Presses and the like, of which the following is a specification.

This invention relates to safety devices, and more particularly, to safety devices for punch presses.

In the operation of punch presses, the

work must be inserted between the punch-A and the die by the operator, and many ac- Y:at

cidents are caused by the inadvertent operation of the punch while the operators hand is between the punch and die. Many safety devices have been proposed to prevent such accidents, but they have not been entirely In some classes of safety de-V successful. vices, a guard moves between the punch and die and the operator, and such a guard has generally been moved downwardly with the punch. Such operation of the guard would cause the operators hand to become caught by the guard moving down on it, thereby holding it in position and causing, in itself, injury. v

The objects of this invention, therefore, are to devise a safety device for punch presses, in which a guard moves in such a manner as to move the operators hand or hands out of the way. A

Further objects will appear from the detail description taken in connection jwith the accompanying drawing, in which:

Figure 1 is a front elevation of a punch a press, showing one embodiment of this inx vention; Fig. 2 is a side elevation; Fig. 3 is an enlargedsection on the line 8-3, Fig. 1; Fig. 4 is an enlarged section on the line 4-4, Fig. 1; and, Fig. 5 is a detail plan view,

showing another embodiment of this inven-Y moving guard will lift his hand or hands out io'o tion.

Referring to the accompanying drawing, and more particularly, to Figs. 1 to 4 inclusive, 10 designates the base and 11 the frame of a punch press of well' known construction. The frame supports a platen '12, and has a guide for a ram 13 operated from the drive shaft 14. A die 15 is mounted upon the platen, while a coperating punch 16 is mounted on the ram. The parts described may be of usual construction, and further description is, therefore, unneces- Specfication of Letters Patent.

Application led August 17, 1914. Serial N o. 857,007.

Patented May 23, 1916.

sary. bracket 17 is attached to the frame 11 1n any suitable manner, as by screws or bolts 18,v and this bracket is provided with an elongated forwardly extending bearing v19. A hollow shaft 20 is mounted in this bearing, and is supported against endwise movement by an arm 21 and a collar 22, both clamped to the shaft by means of suitable screws arranged Hush therewith. The

arm 21, which rotates with the shaft, has pivoted thereto a threaded link 23 passing through a head 24 on a bracket-25 bolted to the rear face of the ram 13. The link has i threaded thereon nuts 26 engaging the opposite faces of the head 24. The shaft 20 has mountedtherein a shank 27 secured in position bya set screw A281, and having an arm 29 arranged in front of and below the die 15 mounted on the platen. A sector-shaped curtainBO, of canvas, ory any other suitable material, is attached to the platen and to the varm 29. The connection between the ram and the arm 29 causes this arm to move upwardlyv from full to dotted line position when' the .ram moves downwardly to punch the material. -It will also be noted that, iny

yso p view of the pivotal mounting of the arm to one side of the die, this arm will move laterally, as well as upwardly. As the arm moves upwardly, the canvas curtain 30 will move in front of the punch and die so as to Y punch and die, and will then usually withdraw his hand before he starts the machine. If, however, he should neglect to withdraw his hand, then the upwardly and laterally of the way, so Ythat they cannot be caught by the punch as it descends. In view of the fact that the guard has a compound upward and lateral movement, the hands will be moved laterally, as well as upwardly. yThe movement of the guard operating on the arm or hand of the operator, positioned in front of the machine, will naturally be such as to cause the hand or hands to be withdrawn away from the punch. This result is brought aboutby moving the guard in a di# different-,sizes rection opposite tothe direction of movement of the punch. As the guard. moves upwardly, the canvas curtain will move between the punch and die and the operator, soas to entirely obstruct thepunch and die until the vpunch again ascends. This will prevent the operatorl from placingvhis hands under the punch until it s safe to do so.

'..f'Ih'e'deviCel'can be applied to any punch press, as thezadjustment of the screws 26 on the link 23,:1a-nd the adjustment of the shank 27 longitudinally oftheshaft 20, will permit application ofthe device to punch presses of In the construction shown in Fig. v5, the arm 29 isv arranged at an obtuse angle with .respect to the shank 27, while the axis'of the bearing 19 isarranged at an obtuse angle with respect to a line drawn parallel to the front of the machine. This construction vcauses the'endv of the arm 29 to move forwardly, 'as well as upwardly and laterally, and thus causes the hands .of lthe operator 4to' be' moved forwardly, or away from the punchand die, as well as upwardly and lat- .erallyl' l v l It; is obvious that various changes may be A.made in details of construction without de- Eam , this' invention is not to be limited to thel parting from the spirit of this invention,

and it is, therefore, to be understood that specific "'constructionvshown and described.

Having thus described the invention, what 1s claimed is:

` 1. In a punch press having a punch car-v rying ram and die, a'safety device having a front guard between the operator' and punch, and operative connections between said ram and guard for moving the latter in a direction opposite lto the movement of the punch and laterally thereof. Y

2. In a punch press having a punch carrying ram and die, a safety device having a guard in front of and normally' below the l 45 and operated by said'ram for moving said level of the die', and means connected Vwith with saidguard in front of said punchand 5 die; H n

In testimony whereof I `affix my signature in the presence of these two witnesses.

y wiLLIAM J. PARKER.

Y Witnesses:

.' 1S. D. HARTQG,

J. H.*B1;UNINGA. j 

